soc: qcom: spcom: add kernel-pil support for SPU

Add an API to userspace that supports SPU PIL.
This API restart SPU.

Change-Id: I934dec53a931e3b97092892b7f1f80599355f961
Signed-off-by: Kineret Berger <kberger@codeaurora.org>
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>